Power press



April 17, 1928.

H. C. H. WALSH POWER PRESS Filed Nov. 1. 1926 4 Sheets-Sheet l April 17, 1928.

H. c. H; WALSH POWER PRESS Filed Nov. 1. 1926 4 Sheets-Sheet 2 "Hui llll' ll II! Plll @Ellllll lllilllllllllll gill/III] kg. 7:: k

ril 17. 192&

I H c, H. WALSH POWER PRESS Filed Nov. 1, 192

4 She'ets-Sheet 3 April 17, 1928. 1,666,275

H. C. H. WALSH POWER PRESS 4 Sheets-Sheet 4 4 of the foot treadle,

Patented Apr.- 17, 1928.

UNITED STATES HARRY C. H. \VALS'H, OF CHICAGO, ILLINOIS.

PO'WER PRESS.

Application filed November 1, 1926.

This invention relates to the provision on a power press, such as a punch press, of an adequately controlled friction clutch which in conjunction with automatically operated brake mechanism enables the power to be quickly and smoothly applied and to beretained during the compression of a foot treadle, and it further provides for the automatic unclutching of power upon the release and the concurrent setting of a brake which will stop the operation of the press immediately thereafter.

Further objects and details will appear from a description of the invention in conjunction with the drawings wherein V Figure 1 is a perspective view of the press as a whole showing the brake mechanism in the foreground and the clutch mechanism in the background;

Fig. 2 is a sectional plan view taken on the plane of the main shaft showing the brake mechanism to the right and the clutch mechanism to the left of the figure;

Fig. 3 is a detail of the brake actuating cone cam;

Fig. 4 is a face View of the sliding collar for actuating the toggles which set the clutch;

Fig. 5 is a view, partly in section, of the toggle mechanism and associated parts;

Fig. 6 is an end elevation looking toward the brake setting mechanism;

Fig. 7 is a detail showing the position occupied by the brake setting mechanism when the foo-t treadle is depressed; and

Fig. 8 is a cross sectional View through the brake shoes and associated parts.

The press as a whole is built uponthe base frame 10 carrying a table 11 of any approved construction, and above the base frame are uprights or standards 12 which furnish overhanging guide members 13. carrying guide plates 14 for the reciprocation of a sliding head 15 which carries the die or other tool employed by the press. The sliding head is actuated by means of a pitman 16 terminating at its lower end in a ball head 17, mounted in the socket 18 at the upper end of the sliding head 15. The details of these features form no part of the present invention ther described.

The pitman at its upper end engages the cranked portion 19 of a crank shaft 20 which is carried within journal mountings 21-22 formed the upper ends of the standards ing means for ward the axis of the lateral relation to the and need not be fur- Serial No. 145,415.

a pointoutside of and adjacent the journal mounting 21 and formed on the shaft is a boss 23which furnishes a mounting for a grooved collar 24 slidable upon the boss. The groove .in the collar receives the inwardly extending flange 25 of a yoke 26 carried by a thrust rod 27 slidably mounted through the uprights 1212 and encircled by a coil spring 28 29 on the thrust rod, the arrangement be- Iig such that when the thrust'rod is released, the action of the spring will cause an outward thrust to the thrust rod thereby carrying the yoke and imparting an outward movement to the grooved collar.

The grooved collar constitutes the actuata plurality of toggle mechanisms, which are best illustrated in Figs. 2, 4- and 5. Each of the toggle mechanisms nnprises what may be termed an actuating link 30, one end of which lies within a recess 31 in the grooved collar, being pivoted upon a cross pin 32. The three or more actuating links extend obliquely inward t0- shaft, and each link at its inwardly projecting end is pivoted upon a cross pin 33, which pin furnishes a pivotal mounting for two pairs of links 34 and 35 respectively.

The pair of links 34 may, for purpose of clarity, e termed the thrust imparting links, and the pair of links 35 the thrust receiving links. The pair of links 34 lie inside of the pair of links 35 and in immediate single actuating link which occupies the center position, as best shown in Fig. 4. The links 34 operate within a recess 36 which constitutes an enlarged continuation of the recess 31 which houses the actuating link 30, and the links operate in an aligned recess 37 in an inner disk plate 38 which is splined or otherwise slidably mounted upon the shaft 20. The links 34 and 35 are both pivoted upon the pin 33 which furnishes a common center for the application of the end thrust utilized in spreading the toggle, but the links34 at their opposite ends are pivoted upon a pin 35) passing through the recess 36, while the links 35 are similarly pivoted upon a pin 40 passing through the recess 37.

\Vith the parts in the unclutched position indicated in Fig. 2, the grooved ring 24 will occupy a position-such as to bring the actuatin link 30 and the thrust receiving links into ibstantial alignment; and in angu bearing against a ring this inward move, the toggle cause an outward sliding movement of'the site to the clutch mechanism,

lar relation to the thrust imparting links 84. As the grooved ring is moved to the left in Fig. 2, the actuating links of the toggle will impart an inwardly directed radial thrust upon the common connecting pin'33, and as thrust is imparted, it will have the efiect of spreading the ends of the links 34: and 35 away from one another, and in view of the fact that the links 34 are pivotally pinned within the unyielding boss 23,

while the disk 3-8, which pivots the ends of the links 35, is slidably mounted and free to action will be effective to disk 38 which is required in setting the brake.

The disk 38 is housed within the overhang rim il of a fly wheel. 42, which also serves as a pulley wheel, being provided with a hub 43 slidable with bushing lt upon an touter end of'the shaft 20. V The web of the wheel 42 carries inner and outer clutch rings ,45 and ldwhich are preferably composed of hard wood, such as maple, and the inner friction ring affords an area of contact for the outer or marginal portion of the disk 38, while the router friction ring 46 affords an area of contact for the marginal portion at of a conically configured disk e 8 which constitutes a cap or closure for the out-er portion of the wheel and is preferably threaded onto the end of the shaft and held in locked relation thereto by the provision of an inner nut 49 and a jam nut 50, as indicated. The inner and outer friction rings are secured to the web of the wheel by the provision of bolts 51, orin any other suitable manner.

As before stated. when the thrust rod '27 .is free to move, it will be thrust to clutch setting position by the action of the spring :28. In order, however, to retard and hold the thrust rod and prevent the spring from acting, an actuating disk 52 is provided which is key-ed upon the end of the shaft 20 oppoand this disk carries on its outer face a cam elevation. 53 of arcuate formation which co-acts with a beveled roller .54 carriedon the end of a pin 55, which latter issiidably mounted within a block 56,,which is provided with a bore .57 whichreceives the reduced end 58 of the thrust 'rod to which it is .keyed or otherwise rigidly secured. The configuration and arrangement of the parts is such that when the pin is thrust inwardly, it will hold the rollerea within the path of movement of the actuating .cam 53, so that as the latter engages the roller thus positioned, it will ride under the roller and exerta retracting movement on the thrust rod against the tension of the spring 28, thereby drawing backthe grooved collar which controls the toggles and releasing the clutch.

In order to permit the cam carrying disk to rotate continuously Without releasing the clutch, provision is made for rawing back p in 63 entered actuated by rock arm 68 bar it) of a foot treadle the roller 54 to a point outside of the line of movement of the cam 52 and holding it in such retracted relation so long as it is desired to maintain the clutch in driving relation to the shaft. Such actuating mechanism will now be described.

The block 54.- vis provided on its lower rear portion with a pair of outstanding ears 59 which carry a pin 60 which constitutes a pivotal mounting for a bell crank lever 61, the upper arm (32 of which engages a cross through the tail end of the 1311155, while the lower arm 6-l of the bell crank 61 has pivoted thereto a draw rodv65 (see Fig. 1), the lower end of which is engaged by a rocking arm 66021 a rock shaft 67 and a link 69 connected with the lever 71 normally held elevated by a spring 72.

The arrangement of this mechanism is sucl-i-that .a depression of the foot lever will turn the rock shaft 67 and exert a down pull on the dra rod 65, which acting through the hell crank lever. will. cause a retraction of thepin :55, as indicated in Fig. 7, thereby withdrawin the roller 54 suificientl to clear the cam 53, so that the latter may rotate continuously without imparting an unclutching action to the toggle mechanism. In this way, a depression of the foot treadle will effect a movement of the parts such that the spring is free to act and throwthe parts into clutch by spring movementwhich avoids any sudden arring or jerking which might attend an operation in which the clutch was set by positive rather than by spring action. In order to better regulate the adjusting moveinentsinvolving the co-action of the roller 5&- and the cam elevation, both of these s faces are beveled in complei'nentary eh .n to one another, which facilitates the withdrawal and release of the roller 5% and its engagcinei'it with and release from the cam.

To quickly stop the rotation of the shaft after a release of the clutch. the following brake mechanism is provided.

The disk 5 carries a friction ring 73 which coacts with the pair of half rings T l which, in conjunction, completely encircle the friction rin T3. and each of the half rings terminates at its forwardly positioned end in an enlarged head 75, the two heads bein mounted in juxtaposed relation upon a r a "It; laterally extending from a finger 7 l forwardly .1;- tending from the journal head 72 or other fixed portion of the machine.

Each of the heads 75 is of half the width of the remainder of the half ring. which half rings extend in opposite relation to one another, and each free end is recessed at the point 7 8 to permit the overlap of the free end of the companion half ring (see Fig. 8), so that the coacting free ends extend opp0- sitely past the medral point and each term!- nates in an outstanding head 79 which carries an adjustable inwardly extending screw b fixedly mounted upon the reduced end 58 ofthe thrust rod 21, the relation being such that when the thrust rod is retracted by the action of the cam 53 on the roller 54, the cone block will slide between the inner ends of the screw stops 79 and serve to spread the free ends of. the half rings in opposite directions, thereby causing the half rings to clamp tightly against the friction ring 73 which serves to impart a. braking action upon the disk 52 and upon the shaft 20.

The operation in brief is as follows: lVith the parts in normal relation, as in Fig.1,

and the foot treadle undepressed, the fly wheel will be rotated freely and in unclutched relation to the shaft. In this adjustment, the arcuate cam elevation 53 will occupy a position such as to hold the roller 54 on the cam elevation, and this will hold the toggle actuating connections retracted to prevent the setting of the clutch.

s soon as the foot treadle is depressed, the roller 54 will be drawn back into position to clear the cam, and the'spring 28 will then be free to act upon the thrust rod which will impart an outward movement to the toggle mechanism for the purpose of setting the clutch. In the setting of the clutch, the inner disk 38 will be moved outwardly until it contacts with the inner friction ring 4.5 after which a further movement of the fly wheel will bring the outer clutch ring into clutching contact with the rim of the outer disk 48, which being fast on the shaft will resist movement, so that the'clutching elements will be held, by spring action, in tight clutching relationto one another.

If the foot treadle be thereupon immediately released, the roller 54 will spring in wardly, under the influence of a small spring 82, acting upon the bell crank 61, so that as soon as the arcuate cam completes a single cycle of operation. it will draw backthe thrust rod 27 and simultaneously set the brake, with the roller 54 resting upon the cam elevation, as in Fig. 1. So long, however. as the foot pressure is retained upon the foot treadle. the roller 54 will be held out of co-operating relation with the cam, and the clutch elements will remain continuously in clutched relation throughout repeated rotations of the shaft, and the up and down movements of the press head 15 will continue. 7

It is necessary to co-ordinate the clutch and braking actions in such away that the shaft will come to rest at a point which maintains the roller This requires a proper co-ordination be- 54 upon the cam 53.

tween the action of the cam and the brake, at this may be readily adjusted and regulated bythe provision of the screw stops 80 which can be properly set to co-act with the cone block 81in such a way as to bring the shaft to rest at the required instant. I

Although the machine has been described with particularity, it is not the intention to limit the invention to the construction hereinbefore set forth, since it is obviousthat a proper co-ordination be tween the clutching and brake setting mechanisms might be effected by other means, and that the clutch mechanism herein described m ght be utilized under some circuinstances without the utilization of any form of brake mechanism.

I claim:

1. In a machine of the class described, the combination of a shaft, a driving element freely mounted upon the shaft, clutch elements associated with such driving element, mechanism for setting said clutch elements in clutching relation, a spring actuated element adapted when released to move such clutch setting elements to clutchingposition, means carried in part by the shaft for restoring said spring actuated element to clutch releasing position, brake mechanism acting on the shaft and operable during the precise details of restoring movement of said spring actuated means to set the brake and stop the shaft concurrently with the release of the clutch, said brake mechanism including a diskon the shaft, a ring encircling said disk, and a member carried by the spring actuated clutch setting memher for compressing the ring during the restoring movement of said spring actuated clutch setting member, substantially as described. Y

2. Ina machine of the class described, the combination of a shaft, :1 driving element freely mounted upon the shaft, a clutch member slidably mounted upon and. rotatable with the shaft, a toggle mechanism adapted when actuated in one direction to imparta clutching n'iovement to said slidably mounted clutch member, spring actu ated means adapted when released to impart a clutch setting movement to the toggle mechanism, restoring devices associated with said spring actuated means for retracting the same against spring tension to effecta release of the clutcln said restoring devices including a cam carried by the shaft. and a member carried by the said sprint actuated devices and pos tioned to be engaged and retracted by said cam at the proper time, and means for suspending the timed engagement between said cam and said member to permit continued engage ment of said scribed.

3. In a machine of the class described,

shaped braking member clutch, substantially as de the" combination of a shaft, a driving element freely mounted upon the shaft, aclutch member slidably mounted upon and rotatable with the shaft, a toggle mecha nism adapted when actuated in one direction to impart a clutching movement to said slidably mounted clutch mem er, spring actuated means adapted when released to impart a clutch setting movement to the toggle mechanism, restoring devices associatet with said spring act ated means forrctractingthr same again spring tension to effect a release of the clutch, said restoring devices including a cam carried by the shaft, a member carried by the said spring actuated devices and posi ied to be engaged and retracted by said cam at the proper time, means for suspending the timedengagement between said memsaid cam and her to permit continued. engagement of said clutch, a brake disk carried by the shaft, a split brake ring; surrounding; the disk and having its free ends in overlapped relation, and a member carried by the spring, actuated clutch setting means "id adapted to act between the overlapped of the split brake ring to clamp the ring against the brake. disk concurrently with the release of the clutch, substantially as described.

' t. In a machine of the class described, the combination of a cranked shaft, and reciprocating head actuated thereby, a driving element freely mounted uponthe shaft, a clutch element slidably' mounted upon and rotatable with the shaft, a toggle mechanism adapted when actuated to bring the clutch element toward the driving element to effect a clutching,- relation therewith, a spring; actuated thrust rod having; engagement with the le mechanism and adapted when re- ,d to throw the toggle mechanism into clutching relation by spring pressure, a roller carried by the thrust rod, a disk carried by the shaft and provided on its rear face with a cam elevation adapted to engage said roller to retract the roller and the thrust rod torclease the'clutch, substantially described.

5. In a machine of the class descril'ied, the combination of a cranked shaft and a reciprocating head actuated thereby, a driving element freely mounted uponthe shaft, a clutch element slidably mounted upon and rotatable with the shaft, a toggle n'ietcauism adapted when actuated to bring; the clutch clement toward the driving element to effect clutching relation therewith, a spring actuated thrust rod having engagement with the toggle mechanism and adapted when re leased to throw the toggle mechanism into clutching relation by spring pressure, a roller carried by the thrust rod, a disk carried bythe shaft and provided on its rear face with a cam elevation adapted to engage said roller to retract the roller and roller with the cam the thrust rod to release the clutch, and means for moving the roller out of the line of movement of the cam for maintaining the clutch elements in clutched relation, substantially as described. V

6. In a machine of the class described, the combination of a cranked shaft and areciprocating head actuated thereby, a driving element freely mounted upon the shaft, a clutch element slidably mounted upon and rotatable with the shaft, a toggle mechanism adapted when actuated to bring the clutch element toward the driving element to eifect a clutching relation therewith, a spring actuated thrust rod having; engagement with the toggle mechanism and adapted when released to throw the toggle mechanism into clutching relation by spring pressure, a roller carried by the thrust rod, a disk carried by the shaft and provided on its rear face with a cam elevation adapted to engage said roller to retract the roller and the thrust rod to release the clutch, a brake u'iechanisin operable to stop rotation of the shaft,and means for actuating said brake mechanism concurrently with the engageclement freely mounted upon the shaft, a

clutch clementslidably mounted upon and rotatable with the shaft, a toggle mechanism adapted when actuated to bring the clutch element toward the driving enient to effect a clutching relation therew'i h, a spring actuated thrust rod having engagement with the toggle mechanism andadapted when released to throw the toggle mechanism into clutching relation by spring pressure, a roller carried by the thrust rod, a disk carried by the sl aft and provided on its rear face with a cam elevatiouadapted to engage said roller to retract the roller and the thrust rod to release the clutch, means for mmringthe roller out of the line of movement of the cam for maintaining the clutch elements in clutched relation, a brake mechanism operable to stop rotation of the shaft. and means for actuat ng said brake me concurrently with the engage elevation,

as described.

8. In a machine of the class described, the combination of a cranked shaft and a reciprocating head actuated thereby. a driving element freely mounted upon the shaft, a clutch element slidably mounted upon and rotatable with the shaft, a toggle mechanism adapted when actuated to bring the clutch element toward the driving element to effect a clutching relation therewith, a spring actuated thrust rod having engagement with the toggle mechanism and adapted when ill) released to throw the toggle mechanism into clutching relation by spring pressure, a roller carried by the thrust. rod, a disk carried by the shaft and provided on its rear face with a cam elevation adapted to engage said roller to retract the roller and the thrust rod to release the clutch, a brake mechanism operable to stop rotation of the shaft, means for actuating said brake mechanism concurrently with the engagement of the roller with the cam elevation, said brake mechanism including a pair of oppositely acting clamping members encircling the shaft, and means on the thrust rod for engaging said members and throwing them into braliing relation tothe shaft upon the return movement of the thrust rod, substantially as described.

9. In a machine of the class described, the combination of a cranked shaft and a reciprocating head actuated thereby, a driving element freely mounted upon the shaft, a clutch element slidably mounted upon and rotatable with the shaft, a toggle mechanism adapted when actuated to bring the clutch element toward the driving element to effect a clutching relation therewith, a spring actuated thrust rod having engagement witn the toggle mechanism and adapted when released to throw the toggle mechanism into clutching relation by spring pressure, a roller carried by the thrust rod, a disk carried by the shaft and provided on its rear face with a cam elevation adapted to engage said roller to retract the roller and the thrust rod to release the clutch, means for moving the roller out of the line of movement of the cam for maintaining the clutch elements in clutched relation, a brake mechanism operable to stop rotation of the shaft, means for actuating said brake mechanism concurrently with the engagement of the roller with the cam elevation, said brake mechanism including a pair of oppositely acting clamping members encircling the shaft, and means on the thrust rod for engaging said members and throwing them into braking relation to the shaft upon the return move ment of the thrust rod, substantially as described.

10. In a machine of the class described, the combination of a cranked shaft and a reciprocating head actuated thereby, a driving element freely mounted upon the shaft, a'clutch element slidably mounted upon and rotatable with the shaft, a toggle mechanism adapted when actuated to bring the clutch element toward the driving element to effect a clutching relation therewith, a spring actuated thrust rod having engagement With the toggle mechanism and adapted when re leased to throw the toggle mechanism into clutching relation by spring pressure, a roller carried by the thrust rod, a disk carried by the shaft and provided on its rear face with a cam elevation adapted to engage said roller to retract the roller and the thrust rod to release the clutch, a brake mechanism operable to stop rotation of the shaft, means for actuating said brake mechanism concurrently with the engagement of the roller with the cam elevation, said brake mechanism including co-acting half ring clutch members encircling the shaft, each half ring member being pivotec at one endand having the non-pivoted ends oppositely extended beyond one another, and a brake actuating member on the thrust rod and movable be tween the overlapped ends of the brake members to spread the same and set the brake upon the return movement of the thrust rod, substantially as described.

11. In a machine of the class described, the combination of a cranked shaft and a reciprocating head actuated thereby, a driving element freely mounted upon the shaft, a clutch element c'o-acting with the driving element, a spring actuated thrust rod and connections for setting the clutch element in clutching relation when the thrust rod is released, means actuated by the rotation of the shaft for retracting the thrust rod at a predetermined point in the shafts rotation, ring shaped clutching elements encircling the shaft and adapted to apply a braking action thereto, said elements having overlapped free ends adapted when spread to set the brake, and means carried by the thrust rod and positioned to move between said overlapped ends to spread the same upon a return movement of the thrust rod, substantially as described.

HARRY C. H. WALSH. 

